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    <title>Document</title>
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    <div id="app"></div>
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    <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
    <script>

     // 创建原素 React.createElement(options1，options2，options3)
     // 1. 创建一个什么类型的html标签
     // 2. 标签得一些属性
     // 3.这个标签得子节点
     var li1 = React.createElement("li",{className:"li1"},"one")
     ReactDOM.render(li1,app)




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